v3.23.3
Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Cash Flows From Operating Activities:          
Net loss $ (2,783) $ (3,865) $ (11,819) $ (14,082)  
Adjustments to reconcile net loss to net cash used in operating activities:          
Depreciation and amortization     675 574  
Share-based compensation     1,648 2,628  
Warranty provision     (8) 55  
Change in fair value of warrant liabilities 117 (0) 117 0  
Non-cash lease expense     80 75  
Provision for doubtful accounts     (48) 61  
Accounts receivable     (1,353) 1,576  
Inventories     (1,780) (1,396)  
Prepaid expense and other current assets     13 268  
Accounts payable     (67) (834)  
Operating lease liability     (80) (65)  
Customer deposits     2 (43)  
Accrued liabilities and other     (322) 175  
Warranty settlement     (8) (63)  
Deferred revenue     32 35  
Net cash used in operating activities     (12,918) (11,036)  
Changes in assets and liabilities:          
Provision for doubtful accounts     (48) 61  
Cash Flows From Investing Activities:          
Purchase of short-term investments     (6,145) (23,119)  
Proceeds from maturities of short-term investments     10,000 33,300  
Capital expenditures for property and equipment     (133) (201)  
Net cash paid for acquisition of Intrensic     (551) 0  
Cash outlay for deposits     (66) (3)  
Net cash provided by investing activities     2,768 9,844  
Cash Flows From Financing Activities:          
Proceeds from exercise of stock options     0 83  
Proceeds from issuance of warrants and convertible preferred stock, net of offering costs     9,754 0  
Net cash provided by financing activities     9,754 83  
Net decrease in cash and cash equivalents     (396) (1,109)  
Cash and cash equivalents, beginning of period     5,330 4,937 $ 4,937
Change in unrealized gain on short-term investments     (94) 62  
Net assets acquired from acquisition     147 0  
Warrant liabilities     (7,834) 0  
Dividends on convertible preferred stock (193)   (193) 0  
Right-of-use asset and liability recorded during period     0 260  
Cash and cash equivalents, end of period 4,934 3,828 4,934 3,828 5,330
Supplemental Disclosure of Non-Cash Investing and Financing Activities:          
us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations $ 4,934 $ 3,828 4,934 3,828 $ 5,330
Convertible Preferred Stock [Member]          
Cash Flows From Financing Activities:          
Issuance of common stock for acquisition     (2,036) 0  
Intrensic, LLC [Member]          
Cash Flows From Financing Activities:          
Issuance of common stock for acquisition     (1,938) 0  
Patents and Trademarks [Member]          
Cash Flows From Investing Activities:          
Investment in patents and trademarks     (277) (133)  
Intangibles Other than Patents and Trademarks [Member]          
Cash Flows From Investing Activities:          
Investment in patents and trademarks     $ (60) $ 0  

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